Question

The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?

Options

• Pachytene

• Diplotene

• Diakinesis

• Zygotene

Answer 1

Pachytene

Explanation:

Meiosis has two rounds of chromosome segregation; thus, it has prophase twice, resulting in prophase I and II. Prophase I has five subphases: leptotene, zygotene, pachytene, diplotene, and diakinesis. Recombination nodules appear during the pachytene stage of prophase I. They form on the synaptonemal complex of bivalents. The recombination nodules facilitate the exchange of genetic information between the non-sister chromatids of the synaptonemal complex during crossing over.